Second round of cleanups for new optional parameter semantics.

tests/standalone/io/http_connection_header_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 
 #import("dart:isolate");
 #import("dart:io");
 
 void setConnectionHeaders(HttpHeaders headers) {
   headers.add(HttpHeaders.CONNECTION, "my-connection-header1");
@@ skipping 15 matching lines @@
   } else {
     Expect.equals(3, headers[HttpHeaders.CONNECTION].length);
     Expect.isTrue(headers[HttpHeaders.CONNECTION].some(
         (value) => value.toLowerCase() == "close"));
   }
 }
 
 void test(int totalConnections, bool clientPersistentConnection) {
   HttpServer server = new HttpServer();
   server.onError = (e) => Expect.fail("Unexpected error $e");
-  server.listen("127.0.0.1", 0, totalConnections);
+  server.listen("127.0.0.1", 0, backlog: totalConnections);
   server.defaultRequestHandler = (HttpRequest request, HttpResponse response) {
     // Check expected request.
     Expect.equals(clientPersistentConnection, request.persistentConnection);
     Expect.equals(clientPersistentConnection, response.persistentConnection);
     checkExpectedConnectionHeaders(request.headers,
                                    request.persistentConnection);
 
     // Generate response. If the client signaled non-persistent
     // connection the server should not need to set it.
     if (request.persistentConnection) {
@@ skipping 24 matching lines @@
       }
     };
   }
 }
 
 
 void main() {
   test(2, false);
   test(2, true);
 }